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Diamond pattern

Programme:

#include <stdio.h>
 
int main() {
 
  int n, c, k, space = 1;
 
  printf("Enter number of rows : ");
  scanf("%d", &n);
 
  space = n - 1;
 
  for (k = 1; k <= n; k++) {
 
    for (c = 1; c <= space; c++)
      printf(" ");
 
    space--;
 
    for (c = 1; c <= 2 * k - 1; c++)
      printf("*");
 
    printf("\n");
  }
 
  space = 1;
 
  for (k = 1; k <= n - 1; k++) {
 
    for (c = 1; c <= space; c++)
      printf(" ");
 
    space++;
 
    for (c = 1; c <= 2 * (n - k) - 1; c++)
      printf("*");
 
    printf("\n");
  }
 
  return 0;
}

Output:

Enter number of rows : 4
   *
  ***
 *****
*******
 *****
  ***
   *